氢氧化钠改性ZSM-5分子筛的碳四烯烃催化裂解性能  

Catalytic Performance of ZSM-5 Catalyst Modified by Sodium Hydroxidefor C_4-Olefin Cracking

作　　者：金文清[1] 赵国良[1] 滕加伟[1] 谢在库[1] 

机构地区：[1]中国石油化工股份有限公司上海石油化工研究院,上海201208

出　　处：《化学反应工程与工艺》2007年第3期193-199,共7页Chemical Reaction Engineering and Technology

基　　金：国家973重大基础研究发展研究项目(2003CB615804)

摘　　要：用不同浓度的氢氧化钠溶液对ZSM-5分子筛进行改性,以X射线衍射(XRD)、扫描电镜(SEM)、氪-程序升温脱附(NH_3-TPD)和N_2吸附方法对改性后的催化剂进行表征,并考察了改性后的ZSM-5分子筛催化剂在碳四烯烃裂解反应中的催化性能。结果表明,氢氧化钠改性没有破坏该分子筛骨架结构,改性后催化剂的酸量、介孔孔径、介孔孔容和比表面积BET都有所增加,从而改善了催化剂的反应性能。氢氧化钠溶液的浓度为0.4 mol/L比较合适,用该浓度的氢氧化钠改性后的ZSM-5分子筛催化剂0.4AT-HZ在550℃和常压下进行碳四烯烃催化裂解反应。具有较高的稳定性,丁烯转化率可达到78%以上,丙烯收率大于38%,丙烷收率为7%。ZSM-5 catalysts were modified by different concentration sodium hydroxide solution and characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, NH3-TPD and N2 adsorption. The catalytic cracking performances of C4-olefin over the modified catalysts, were investigated. The results showed that the framework structure of ZSM-5 was scarcely damaged after modification , the acid content, mesopores diameter, pore volume and BET surface area were increased and the catalytic cracking performances of modified ZSM-5 catalyst was improved. Sodium hydroxide solution appropriate concentration was 0. 4 mol/L and the C4-olefin cracking reactions was carried over the ZSM-5 catalyst modified by 0.4 mol/L sodium hydroxide solution under the conditions of 550 ℃ and atmospheric pressure. The C4-olefin cracking reaction results showed that catalytic performance of the ZSM-5 catalyst modified by 0.4 mol/L sodium hydroxide solution was stable, the conversion of butene was above 78%, the yield of propylene wan above 38% and the yield of propane was 7 0%.

关 键 词：ZSM-5分子筛 氨氧化钠 催化裂解 碳四烯烃 

分 类 号：TE624.41[石油与天然气工程—油气加工工程]